Transcript 11-15-1057

Sept 2015
doc.: IEEE 802.11-15/1057r0
Multiple Resource Unit Allocation for TGax
OFDMA
Date: 2015-09-12
Authors:
Name
Affiliations Address
Phone
Kome Oteri
Alphan Sahin
Chunhua Geng
Rui Yang
email
858 210 4826 [email protected]
InterDigital
Communication
Inc.
9710 Scranton Road,
San Diego, CA,
92121
Robert Olesen
Submission
Slide 1
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Outline
•
•
•
•
•
Motivation
Existing design and open questions
System Level Simulation assumptions and results
Link Level Simulation assumptions and results
Conclusion
Submission
Slide 2
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Motivation
• Show potential benefits of multiple RU allocation over
single user allocation via system simulations.
– Identify need for updated interleaver design to enable
multiple RU allocation
• Show potential benefits of non-contiguous multiple RU
allocation over contiguous multiple RU allocations via
system and link level simulations
Submission
Slide 3
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Existing Design
•
OFDMA Numerology and Structure
[1]
– PHY #10: Define 20MHz, 40
MHz, 80MHz, 160MHz / 80MHz
+ 80MHz OFDMA building
blocks
Numerology for 20MHz
•
Interleaver and Tone Mapper for
OFDMA [2]
– PHY #33: The BCC interleaver
and
LDPC
tone
mapper
parameters to be defined in the
table below
Submission
BCC Interleaver and LDPC Tone Mapper
Slide 4
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Open Questions
• Q: Should we allocate more than one RU per user ?
• Q: If multiple RUs can be allocated per user, how does this affect the
interleaver design?
– Observation: current design does not take all multiple RU allocation
scenarios into consideration e.g. 3 x 26-tone RU allocation
• Q: If multiple RUs per user are allocated, should those RUs be
contiguous or non-contiguous ?
– DL OFDMA Signalling [3]
• SP1: Do you think we should be able to express non-contiguous RU allocation?
Y:N:A = 46:22:54
Submission
Slide 5
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Study Outline
• Study system throughput performance in SS1 and SS3 for
– Single RU allocation
– Multiple RU allocation : contiguous
– Multiple RU allocation : non-contiguous
• Study link level performance for MCS 7 in Channel D
– Multiple RU allocation : contiguous
– Multiple RU allocation : non-contiguous
Submission
Slide 6
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
System Throughput Simulation Assumptions
• No MAC protocol overhead assumed
• STAs are located based on specific TGax simulation scenarios [4]
20 MHz
80 MHz
Table derived from [8]
Submission
Slide 7
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Scheduler (20 MHz)
20 MHz Numerology
Resource allocation for single RU allocation
Resource allocation for Contiguous Case
Resource Allocation for Non-contiguous Case
Submission
Slide 8
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
bps
20 MHz Results (System Simulations)
Legend
sRU: Single RU Allocation
C:
Multiple RU Contiguous Allocation
NC: Multiple RU Non-contiguous Allocation
Performance gains for multiple RU non-contiguous allocation over single RU and multiple
RU contiguous allocation can be observed
Submission
Slide 9
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
bps
80 MHz Results (System Simulations)
Legend
sRU: Single RU Allocation
C:
Multiple RU Contiguous Allocation
NC: Multiple RU Non-contiguous Allocation
Larger gains for multiple RU non-contiguous allocation over single RU and multiple RU
contiguous allocation over larger bandwidth can be observed
Submission
Slide 10
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Link Level Simulation Assumptions
Submission
Slide 11
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Link Level Contiguous/Non-Contiguous Allocation
Gains observed for non-contiguous over contiguous at the link level
Submission
Slide 12
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Multiple RU Interleaving
• Q: How do we perform interleaving in multiple RU allocation ?
– Reuse design in [2] with a multiplexer (S/P) and de-multiplexer (P/S)
Interleaver
.
.
.
Interleaver
Slide 13
P/S
QAM Map
Frequency
Parser
Interleaver
S/P
Submission
P/S
RU1
RUM
.
.
.
Frequency
Parser
.
.
.
Antenna Map
Spatial Stream Parser
BCC Encoder
Scrambler
S/P
Space-Time Block Encoder
Interleaver
Kome Oteri (InterDigital)
RU1
RUM
Sept 2015
doc.: IEEE 802.11-15/1057r0
Conclusions
• Multiple RU allocation shows benefits over single RU allocation in
some system level simulation scenarios (SS3)
• Non-contiguous multiple RU allocation shows benefits over
contiguous multiple RU allocation
• The interleaver design should be updated to allow for multiple RU
allocation
Submission
Slide 14
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Straw Poll #1
Do you agree to add to the TG Specification Framework?
• The amendment shall allow multiple RUs to be allocated to a single
user
• Y/N/A
Submission
Slide 15
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Straw Poll #2
Do you agree with the following?
• The design of the interleaver shall be updated to allow for multiple RU
allocations that are not captured in the current interleaver design
• Y/N/A
Submission
Slide 16
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Straw Poll #3
Do you agree to add to the TG Specification Framework?
• The amendment shall allow for non-contiguous allocation of multiple
RUs to a single user
• Y/N/A
Submission
Slide 17
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
References
1.
2.
3.
4.
5.
11-15-0330-05-00ax-ofdma-numerology-and-structure.pptx
11-15-0816-00-00ax-interleaver-and-tone-mapper-for-ofdma.pptx
11-15-0854-02-00ax-dl-ofdma-signalling.pptx
11-14-0980-14-00ax-simulation-scenarios.docx
11-14-0882-04-00ax-tgax-channel-model-document.docx
Submission
Slide 18
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Additional Material
Submission
Slide 19
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Granularity Definition
@ Receiver: Instantaneous rates on the sub-channels (based on feedback granularity
(FG)) are calculated and fed back to the transmitter.
@ Transmitter: Instantaneous rates on the RUs (based on RU granularity (RG)) are
calculated for each station and proportional fair scheduling is performed.
Other users may
use different
granularity.
Submission
Slide 20
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Gain Definitions
%28.5
%29.5
%1.9
Ref:C
Ref:R
NC: Non-contiguous allocation
Submission
C: Contiguous allocation
Slide 21
R: Random allocation
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
SISO Result Details
NC: Non-contiguous allocation
Submission
C: Contiguous allocation
Slide 22
R: Random allocation
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
MIMO Result Details
NC: Non-contiguous allocation
Submission
C: Contiguous allocation
Slide 23
R: Random allocation
Kome Oteri (InterDigital)
Sept 2015
doc.: IEEE 802.11-15/1057r0
Simulation Methodology of System Throughput
• Obtain per tone SINR of STAs based on path loss and shadowing of
specific simulation scenario [12] and fading channel [2]
• Estimate effective SINR of sub-channels based on the specific
numerology using the capacity mapping in [11] at the receiver
• Send these to the transmitter using the desired FG
• Perform proportional fair scheduling at the transmitter based on
effective SINR of different sub-channels at the desired RG [9]
• Assign users to sub-channels
• Estimate PHY layer system throughput based on capacity of chosen
users
• Average over multiple drops
Submission
Slide 24
Kome Oteri (InterDigital)